Top Tweets for #lcgalacticacceleration
Enjoying my free afternoon and light and after a great #LCGalacticAcceleration at @lorentzcenter
Windmills, canals, pancakes.
@deniserkal with the final talk of the #LCGalacticAcceleration workshop putting stream measurements and models into context of accelerations.
@jorgito__moreno telling us the beautiful story of how he named seven simulated galaxies that lack dark matter in honour of seven Cherokee clans and calling for more inclusivity in astro! #LCGalacticAcceleration
The legend continues! @HeidiJoNewberg convinces the hotel bar to make a Manhattan at #LCGalacticAcceleration.
Learned a lot about Galactic Acceleration from the @lorentzcenter workshop on Real time Galactic Dynamics #LCGalacticAcceleration
What a week! 😄 Last Friday I rounded off my master thesis under supervision of @amina_helmi. This week I'm at @lorentzcenter for #LCGalacticAcceleration, presenting my work from the past year, learning a lot and meeting lots of lovely people! Science is amazing 🤩
Loved presenting my work on the coolest objects of the universe -Metal poor stellar streams and how they cause disequilibrium in the Milky Way at the @lorentzcenter workshop on Galactic Acceleration #LCGalacticAcceleration
@SophiLilleengen is a wild photographer, more on thread
Four years ago I was here at the University of Leiden for LEAPs! 🤩 It feels very good and reminiscent to be back for #LCGalacticAcceleration, now talking about my PhD work!
Getting started here at @lorentzcenter at #LCGalacticDynamics!
Today we start out with “101” talks on the 4 elements of the workshop: EPRVs, eclipse timing, pulsar timing, and theory/modeling of the dynamical disequilibrium of the Milky Way.
Gaudi:
@sukanya_X et al (2022) showed there are enough in the Kepler field to do this, and PLATO will follow them up 15 years later!
Will reveal a range of distances for Galactic acceleration.
#LCGalacticAcceleration
Gaudi:
1) Use Kepler or TESS for 1st epoch, use precise RVs to characterize companions and masses.
2) Constrain confounding effects.
3) Followup after 10 years with with HST, JWST or ARIEL, Twinkle, PLATO.
#LCGalacticAcceleration
Gaudi:
…Applegate mechanism, magnetic braking.
Others (precission + gravity darkening).
Need to choose binaries well! Some are analytic and can subtract them. Others are unimportant for well chosen systems. Generally: old, well-detached binaries.
#LCGalacticAcceleration
Gaudi:
Need a good time standard. Recommend use BJD(TDB) (accounts for Rømer dela, clock corrections, Shapiro delay and Einstein delay in the Solar System). Basically a solved problem, but be careful.
#LCGalacticAcceleration
Gaudi:
If you miss ingress or egress, you're in trouble, because it's degenerate with transit duration.
Correlated noise also bites you here! Can't assume white noise.
#LCGalacticAcceleration
Next up is @bsgaudi talking about eclipse timing.
Some challenges will be:
- nonuniform coverage of eclipse
- correlated noise
- imperfect time standards, and
- astrophysical "noise."
#LCGalacticAcceleration
Conference time at the Lorentz Center in Leiden. Ready to learn more about Galactic Dynamics, disequilibrium, pulsar timing, EPRV observations and DM models...
#LCGalacticAcceleration
Question: how many pulsars can we do this for?
Freire: About 10. They are 100s of pc to kpcs away.
#LCGalacticAcceleration
Freire: Assuming GR is right, we can invert and say we are measuring the Galactic acceleration for systems with good distance. We need better distances! VLBI can help.
#LCGalacticAcceleration
Friere: …except that uncertainties in the Galactic acceleration provide a precision floor.
J2222-0137: has exquisite measurement of distance, again limited by the Galactic acceleration. Residuals are of order 0.3 cm/s/dec
Double pulsar is 0.08 cm/s/dec
#LCGalacticAcceleration
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